chore: update mocha

Author: vicanso

package.json

@@ -39,6 +39,6 @@
     "eslint-plugin-react": "^6.8.0",
     "istanbul": "^0.4.5",
     "jsdoc": "^3.4.3",
-    "mocha": "^5.2.0"
+    "mocha": "^3.5.3"
   }
 }